- Use of any drug known to induce or inhibit hepatic drug metabolism (examples of inducers: barbiturates, carbamazepine, phenytoine, glucocorticoids, omeprazole; examples of inhibitors: antidepressant (SSRI), cimetidine, diltiazem, macrolides, imidazoles, neuroleptics, verapamil, fluoroquinolones, antihistamines) within 30 days prior to period 1 dosing.